A visitor takes in Anri Sala's Ravel Ravel Unravel installation in the French pavilion of the 55th Venice Biennale. Gabriel Bouys/AFP/Getty Images hide caption

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A massive cruise ships towers over Venice. Some 650 cruise ships now visit the Italian city annually, and critics say they threaten the city's fragile architecture. Courtesty of the No Big Ships Committee hide caption

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A visitor walks past an exhibit in the Encyclopedic Palace. Gabriel Bouys/AFP/Getty Images hide caption

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Il Palazzo Enciclopedico: A visitor puzzles over the multitude of choices offered by the the 55th International Art Exhibition of La Biennale di Venezia. It runs from June 1 to November 24, 2013. Marco Secchi/Getty Images hide caption

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